Truing and balancing device for face type diamond grinding wheels



Dec. 4, 1951 E. SPEICHER TRUING AND BALANCING DEVICE FOR FACE TYPE DIAMOND GRINDING WHEELS Filed Feb. 24, 1951 IN VEN TOR. ans/e SPt/dlk.

A Tram/E Patented Dec. 4, 1951 UNITED STATES PAT-E'NT F F ICE 'TRUING BALANCIN G DEVICE FOR FACE TYPE DIAMOND GRINDING IWHE'EIIS Elmer LSpeicher, Birmingham,.lvlich.

Application' February 24, 1951, Ser-ial'No. 212,336

(Clam-@168) Claims. .1 This :applicationis a continuation in part :of my earlier filed application,-Serial N0. 183,80 filed September 8, 1950, now Patent -No. 2,546,529 dated Marchfil, 1951.

This invention relates toa truing and balancing device for a iacetypediamondgrinding wheel,

andmore particularly to a novelconstruction-associated with the grinding wheel by which the grinding surface thereof may be arranged in a plane at right angles to its axisof rotation.

It is the object of :the present inventionto providc an unusual and simplified construction in conjunction with --a face two diamond grinding wheel to permit truing of the same.

It'is a further-object of the present invention to-provide abalancing means in-association with the truing means for minimizing vibration of said grinding wheel during-rotation.

These andother objects'will be-seen from the following-specification and clalmsin conjunction with the appended drawing in which-- Fig. 1 is a frontelevational view of the-grinding wheel.

Fig. 2 is-asection-on line 2-2 of Fig. Lot-the face type diamond grin-ding wheel as mounted upon its driving spindle, 'fragmentarily shown, there being a 'truing indicator provided.

'Fig. 3 is a'similar view illustrating aslight variation of the construction shown'inFig. 2;

'Fig. 4 is another-variation, being asimilar view to thatshown in Figs. '2 and 3-; andFig. 5is another variation, being 'a similarwiew "to Fig. 4.

It will be understoodthat the above drawing illustrates merely apreferred-embodimgent ofthe invention and that other embodiments are contemplated within the scope of the claimshereafter set out.

Referring-to the drawing thepresent face type diamond grinding wheel includes "the circular plate H'having'a central depression 'Iland corresponding thereto the central :plate I'2.

There'is provided upon "the peripheral portion of'said grinding wheelan annular abrasive ring is which is intimatelybonded and secured to circular plate H' and which'includes a conventional diamond abrasive surface .wherein finely divided diamond particles are secured in the ring form f3 asshown in Figsfil and 2.

The present diamond grinding wheel I l-'| 2|'3 has.a central;aperture to receive the central projecting stem I 4 of the rotatable wheel driving spindle l5, saidspindle having an annular flange I6 adjacent its outer end and arranged at the inner end of the stem M-asshown in Fig. 2.

Circular back plate I! has a central opening which similarlyreceives thestem 14 after which the central plate I 2 of the grinding wheelis positioned .upon said stem and .immovably secured thereonbyzthenut' 22-.which engages the threaded portion 2! on the :outer end of said :stem.

.The :back plate 11 of "the grindin wheel assembly has a plurality of :spaced circularly :arranged ftappedopeningswithin which arethreadably .projectedrscrews l8.as,shown in Figs. 1, andZ, there being suitable clearance openings .28 formed in the wheelcelement t2.

:Inssetting up. the grinding wheel for'testingthe face I23 to .determine :whether all points upon its outersurface lie iinthe same plane at right. angles to the axis of rotation of the spindle 15, said grinding wheel is arranged as shown :in Fig. 2 With-a suitable indicator-'23 beingnprovided. Said indicator is mounted 'upon a Ibracket '25 and in:- cludesLthe rotatable indicator arm 24,:the lateral extension 26.and the actuating arm 21 whichis arranged :norm-ally of the outer surface of the grinding surface 13. By setting the indicator with :respect to :and in slight contact with the surface of the grinding wheel, rotation of the latter will indicate whether its surface is true, and whether all points upon its surface lie in a plane normal to the axis of rotation of the driving spindle [5.

Variations in the surface l3 are corrected by adjusting the screws l8 selectively so that the inner ends thereof are in operative engagement with the inner surface of the flange it. These screws are turned placingportions of the flange l fi-under a slight bending-moment until the'wheel is so adjusted that rotation "thereof with respect to the indicator arm 21 will show little ornowa-riation =on the indicator arm '24 with respectto thedial-of said indicator. Theclearance openings "28 are-spaced and circularly arranged within the wheel element [2 to provideaccess to the screws i8 and to permit their adjustments such as byasoc-ket wrench or the like.

' When the grinding wheel has been properly adjusted'so-that its outer grinding'surface l3 lies in a plane at-right angles to the axis of rotation of spindle 5, then said "grinding wheel has been properly =trued, as shown by indicator 23.

Normally the grinding-wheel-is not completely balanced, and upon rotation "thereof certain vibrations may be set up. This is counteracted and overcome by the slight variationshown in Fig. 3 -of-the drawing, by applying one or more of thenuts "l9- tothe-screws l8 placing the same selectively and locking the same mposition upon oneor more of thescrews -I-8' by'the lock nuts' ifl which are also threaded upon the corresponding screw. .It will be noted that the :nutor :nuts 19 arespaced ;from the interior wall .of .the central platen of the-grinding wheel so as not to interfere with the setting of the .screw with respect to .fiange l6 .and the back plate 11. Similarly clearance openings 28 are provided in plate [2 in order to receive the screws l8 and to permit their adjustment.

By the construction shown in Fig. 3 there is provided a simplified truing and balancing device for the face type diamond grinding wheel such as is shown in the drawing.

Fig. 4 illustrates another variation of the structure shown in Fig. 2 but wherein the clearance openings 28 of the wheel [2 may be omitted and the screws 18" are employed, being threaded through spaced circularly arranged tapped openings in the spindle flange [6. The inner ends of screws I8" are adapted to operatively bear against the back plate I! placing the same under such tension at selected points by said screws as to effectively align the grinding surface l3 of the grinding wheel, in the same manner as above described with respect to Fig. 2.

Furthermore the grinding wheel may be balanced by the application of one or more nuts 19 the same as in Fig. 3 with accompanying lock nuts 26 for setting nuts IS in the desired adjusted position.

It is contemplated that under some conditions in the embodiment shown in Fig. 4 the circular back plate Il may be omitted so that the rear surface of the grinding wheel bears directly against the forward fiat surface of the flange I6 on spindle !5. Accordingly the inner ends of the screws l8. threaded through flange l6, would operatively bear against the wheel l2, and by this arrangement the abrasive surface I3 of the grinding wheel ll could be properly aligned.

The variation shown in Fig. is similar to that shown in Fig. 4 except that flange I6 is of slightly less diameter and the socket headed screws IB extend through back plate I! for operative adjusting engagement with the rear surface of wheel 12.

A plurality of spaced circularly arranged threaded openings are formed in back plate I! to receive screws IB. In a similar fashion balancing nuts [9 and lock nut are adjust ably positioned selectively on some of the screws l8.

Having described my should now be had to the claims which follow for determining. the scope thereof.

I claim:

1. In combination, a face type diamond grinding wheel having an annular flat abrasive surface at right angles to its axis of rotation, a rotatable spindle upon which said wheel is centrally mounted and secured, a flat back plate secured upon said spindle and arranged at a right angle to its axis of rotation and against which said wheel bears, and a plurality of spaced circularly arranged set screws threadably projected through said back plate with their inner ends operatively engaging said spindle to the extent that the outer face of said grinding surface lies in a plane at right angles to the axisof rotation of said spindle, said grinding wheel having a plurality of spaced circularly arranged openings into which said screws loosely extend.

2. In combination, a rotatable spindle, a central stem projecting axially therefrom, a circular back plate mounted upon said stem and arranged at right angles to the axis of said spindle, a face.

type diamond grinding wheel having an annular fiat abrasive surface at right angles to its axis of rotation mounted and secured upon said stem and bearing against said back plate, said wheel having a plurality of spaced circularly arranged 4 apertures, and a plurality of spaced circularly arranged set screws within said apertures threadably extending through transverse threaded apertures in said back plate and operatively bearing against said spindle for adjusting the inner face of said back plate with respect to said spindle so that said grinding surface lies in a plane at right angles to the axis of rotation of said spindle.

3. In combination, a rotatable spindle having a circular flange adjacent one end thereof at v right angles thereto, a central stem projecting invention reference axially therefrom, a circular back plate mounted upon said stem and bearing against said flange, a face type diamond grinding wheel having an annular flat abrasive surface at right angles to its axis of rotation mounted and secured upon said stem and bearing against said back plate, and a plurality of spaced circularly arranged set screws within openings in said grinding wheel and threadably extending through threaded apertures in said back plate adjustably and operatively bearing against said flange for adjusting said back plate with respect thereto so that said grinding surface lies in a plane at right angles to the axis of rotation of said spindle.

4. In combination, a rotatable spindle having a circular flange adjacent one end thereof at right angles thereto, a central stem projecting axially therefrom, a circular back plate mounted upon said stem and bearing against said flange, a face type grinding wheel having an annular fiat abrasive surface at right angles to its axis of rotation mounted upon said stem and bearing against said back plate, a plurality of spaced circularly arranged set screws within openings in said grinding wheel and threadably extending through threaded apertures in said back plate adjustably and operatively bearing against said flange for adjusting said back plate with respect thereto so that said grinding surface lies in a plane at right angles to the axis of rotation of said spindle, said stem being exteriorly threaded, and a nut mounted upon said stem and operatively bearing against said grinding wheel for securing the same on said spindle.

5. In combination, a rotatable spindle, a central stem projecting axially therefrom, a circular back plate mounted upon said stem and arranged at right angles to the axis of said spindle, a face type diamond grinding wheel having an annular H flat abrasive surface at right angles to its axis of rotation mounted and secured upon said stem and bearing against said back plate, a plurality of spaced circularly arranged set screws loosely within openings in said wheel and threadably extending through transverse threaded apertures in said back plate and operatively bearing ELMER SPEICHER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Speicher Mar. 27, 1951 I 

